tests: reorganize packages (#7)

* tests: reorganize testing packages

* gitignore and minor changes

tests/solidity/suites/basic/migrations/1_initial_migration.js

@@ -0,0 +1,5 @@
+const Migrations = artifacts.require("Migrations");
+
+module.exports = function (deployer) {
+  deployer.deploy(Migrations);
+};